Transcript Lipids: Fats & Oils - R

Lesson 7d: Lipids (Fats & Oils)
Lipids
Concentrated energy molecules
Regents Biology
Lipids
 Examples

fats

oils

waxes

hormones
 sex hormones
 testosterone (male)
 estrogen (female)
Lipids
 Function:

energy storage
 very concentrated
 twice the energy as carbohydrates!
cell membrane
 cushions organs
 insulates body

 think whale blubber!
Molecular Structure of Fat
not a chain (polymer) = just a “big fat molecule”
1 double bond = unsaturated
More than 1 double bond = polyunsaturated
Saturated vs. unsaturated
saturated
unsaturated
Double Bond!
Saturated fats
 Most animal fats

solid at room
temperature
 Limit the amount
in your diet
contributes to
heart disease
 deposits in
arteries

Unsaturated fats
 Plant, vegetable & fish fats

liquid at room
temperature
 the fat molecules
don’t stack tightly
together
 Better choice in your
diet
Other lipids in biology
 Cholesterol
good molecule in cell membranes
 make hormones from it

 including sex hormones

but too much cholesterol in blood may
lead to heart disease
Good vs. Bad Cholesterol
Total Cholesterol Levels < 200
LDL = BAD!
Needs to be below 100
HDL = GOOD!!
Needs to be 60 or above
Triglycerides = BAD!
Needs to be 150 or below
Cholesterol Quiz
http://www.americanheart.org/presenter.jhtml?identifier=3032767
Cholesterol Video 23:00
http://player.discoveryeducation.com/index.cfm?guidAssetId=D0DC3225-D27A-4E3A-8CD07BCB3B1241A4&blnFromSearch=1&productcode=US
Other lipids in biology
 Cell membranes are made out of lipids
phospholipids
 heads are on the outside touching water

 “like” water

tails are on inside away from water
 “scared” of water

forms a barrier
between the cell
& the outside